We have a 2008 RTV 1100. Ready to do a fluid and filter change on the HST and wondering how much fluid to have on hand. We bought this unit used back in 2010 and never bothered to pick up a manual. Poking about on-line, it looks like the capacity is listed as being 2.6 gallons. I am thinking that we will get less than a complete drain and that a 2.5 gallon jug should cover the job. Anyone here that can confirm or correct my thinking? Also, since our BX1870-1 specifies SUDT, I figured I would used the same in the older RTV. Any reason not to, other than cost? Thanks in advance. 